Mesectoblast
中外胚层, 外中胚层
🗣️ 情景例句
He is still unable to express himself in English.
他仍然不能用英语表达自己的意思。
Do as you would be done by.
推己及人。
It took me ten minutes to persuade her to ring back later.
我用了10分钟的时间才说服她过会儿再来电话。